Alomejor Bicycle Engine 49CC 4 Stroke Gas Engine Motor for DIY Bicycle Bike Conversion Motorized Bike Kit

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the only thing I have to mention is that with a freewheel, I'm not sure how I would attach it to the back wheel.

Someone told me that 49 cc works better, he actually put my old 49cc on his bike and said it works great! With that being said for an 800 Watt motor I recommend gearing the bike to go around 24 miles per hour.VAlso the hole that was machined for the jackshaft bearings was too large for the bearing allowing the shaft and sprocket to wander and jerk around.

the problem is that a lot of the engines stamped 48 and 49cc are actually 72cc, when you remove the head you can measure the bore size and you will notice that almost every engine stamped 48cc that I have come across is actually 72cc. They are generally faster and have a faster piston engine, while 49cc engines are generally more efficient and have a more powerful components.If the bike is used only on flat ground then the freewheel will not increase ride time by much, however if the bike is being used on ground that is not flat then when going downhill it will allow the bike to freewheel with the motor off which will increase ride time. I noticed a while back that most of the engines labeled 48cc were actually 72s but in the last few months I also found a lot of engines labeled 49cc to be 72s also. However frame geometry can still be very different depending on model and manufacturur for the same size seat post tube. x 24 TPI threads for the freewheel to mount onto it, and I see that it is not threaded to accept a freewheel so I so not know of any way to mount one to it.

I was hoping I'd get 30+ mph, but if I go beyond 20mph, engine rattles like crazy and nuts/bolts start falling out.Sorry hellboy i wasn't trying to poke fun at you sometimes i just can't help to be a smart A** I wasn't trying to insult you at all, i know how impatient you can be waiting for a new bike I'm on my 3rd bike and everytime i get a new one i try to find out as much info in advance as i can don't take it to heart i was just messin with ya a little, it will be very obvious when you get the bike like i said it's on the left side down low on the block and mine actually had a long white sticker on the top of the motor on the transmission case that had a real long number on it but the serial number was the very first part of the number on the sticker so check both places and let us know what it says also look at the number cast on the head. Disclaimer: Operating a bike, motorized bicycle or bike with a bicycle engine kit installed involved some risk of serious bodily injury. Also, I am unsure how to connect the fuse to the battery pack and in general, wiring the fuse, key switch, battery pack, and controller together. If you play around on the calculator with the weight of the vehicle you will notice that it has no effect on the power that is required on flat ground to propel a vehicle at any speed. To choose the sprockets for the fastest gear ratio the power of the motor and speed that it can propel the bike need to be calculated.